Lie in bed tossing? It's most unpalatable (8)
I believe the answer is:
inedible
'most unpalatable' is the definition.
'inedible' can be an answer for 'unpalatable' (unpalatable can mean not very nice to eat). I am not sure about the 'most' bit.
'lie in bed tossing?' is the wordplay.
'tossing?' is an anagram indicator.
'lie'+'in'+'bed'='lieinbed'
'lieinbed' is an anagram of 'INEDIBLE'.
'it's' acts as a link.
Can you help me to learn more?
(Other definitions for inedible that I've seen before include "Awful to taste" , "unfit for course!" , "Not fit for eating" , "needing to be taken off table?" , "not course material?" .)